Quantum key distribution with high loss: toward global secure communication.

  title={Quantum key distribution with high loss: toward global secure communication.},
  author={Won Young Hwang},
  journal={Physical review letters},
  volume={91 5},
  • W. Hwang
  • Published 24 November 2002
  • Computer Science, Physics
  • Physical review letters
We propose a decoy-pulse method to overcome the photon-number-splitting attack for Bennett-Brassard 1984 quantum key distribution protocol in the presence of high loss: A legitimate user intentionally and randomly replaces signal pulses by multiphoton pulses (decoy pulses). Then they check the loss of the decoy pulses. If the loss of the decoy pulses is abnormally less than that of signal pulses, the whole protocol is aborted. Otherwise, to continue the protocol, they estimate the loss of… 

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